100-2x=30

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Solution for 100-2x=30 equation: 



100-2x=30

We move all terms to the left:

100-2x-(30)=0

We add all the numbers together, and all the variables

-2x+70=0

We move all terms containing x to the left, all other terms to the right

-2x=-70

x=-70/-2

x=+35

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